Enable incremental builds in docker-compose.yml

Because regenerating the whole thing is too slow.

Author: yrodiere

docker-compose.yml

@@ -3,6 +3,9 @@
 services:
   jekyll:
     image: bretfisher/jekyll-serve
+    # Add --incremental to the commandline
+    # https://github.com/BretFisher/jekyll-serve/blob/2119a31476e1c6004a4bea4739b9160fc73e7bda/Dockerfile#L27C5-L27C94
+    command: [ "bundle", "exec", "jekyll", "serve", "--force_polling", "-H", "0.0.0.0", "-P", "4000", "--incremental" ]
     volumes:
       - .:/site
     ports: